The Netgear VEVG2500 is hard a to find device, but it does/did exist, presumably distributed by ISPs in France/Italy/etc. The Netgear VEVG3700 seem to be its successor, but it's Chipset is unknown. Finally the DGND3700 is referred to as the successor to the VEVG3700, and sadly the DGNG is Broadcom-based, which means: there are no VDSL2-drivers for the newer devices.
Like stated here: https://forum.openwrt.org/viewtopic.php?pid=173561#p173561 it's GPL-dump VEVG2500_v07.00.02_with_Toolchain_src.zip could serve for finally supporting the Lantiq VR9-SoC via the
ltq-dsl-package, which would add support for the first VDSL2 modem.